package com.wmz.picture.service.impl;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.wmz.picture.exception.BusinessException;
import com.wmz.picture.exception.ErrorCode;
import com.wmz.picture.mapper.UserMapper;
import com.wmz.picture.model.dto.space.SpaceAddRequest;
import com.wmz.picture.model.dto.user.UserQueryRequest;
import com.wmz.picture.model.entity.User;
import com.wmz.picture.model.enums.UserRoleEnum;
import com.wmz.picture.model.vo.LoginUserVO;
import com.wmz.picture.model.vo.UserVO;
import com.wmz.picture.service.SpaceService;
import com.wmz.picture.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.wmz.picture.constant.UserConstant.PRE_USER_NAME;
import static com.wmz.picture.constant.UserConstant.USER_LOGIN_STATE;

/**
* @author lihechun
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2024-12-14 23:26:51
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService {
    
    @Resource
    private SpaceService spaceService;
    /**
     * 用户注册
     * @param userAccount 用户账号
     * @param userPassword 用户密码
     * @param checkPassword 确认密码
     * @return 用户ID
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1.参数校验
        if(StrUtil.hasBlank(userAccount,userPassword,checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空！");
        }
        if(userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短！");
        }
        if(userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短！");
        }
        if(!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"两次输入的密码不一致！");
        }
        // 2.校验账号是否重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if(count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号重复！");
        }
        // 3.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 4.插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserRole(UserRoleEnum.USER.getValue());
        user.setUserName(PRE_USER_NAME + userAccount);
        boolean saveResult = this.save(user);
        if(!saveResult) {
            log.info("user login failed,userAccount cannot match userPassword！");
            throw new BusinessException(ErrorCode.SYSTEM_ERROR,"注册失败，数据库错误！");
        }
        // 5.自动创建空间：允许创建失败，如果失败，之后可以手动创建；
        spaceService.addSpace(new SpaceAddRequest(), user);
        return user.getId();
    }

    /**
     * 用户登录
     * @param userAccount 用户账号
     * @param userPassword 用户密码
     * @return 脱敏后的用户信息
     */
    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1.参数校验
        if(StrUtil.hasBlank(userAccount,userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空！");
        }
        if(userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短！");
        }
        if(userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短！");
        }
        // 2.加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 3.查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        queryWrapper.eq("userPassword",encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        if(user == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户不存在或密码错误！");
        }
        // 4.记录用户登录态
        request.getSession().setAttribute(USER_LOGIN_STATE,user);
        return this.getLoginUserVO(user);
    }

    /**
     * 获取用户登录信息
     * @param request   请求
     * @return  用户信息
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 判断用户是否登录
        User user =(User) request.getSession().getAttribute(USER_LOGIN_STATE);
        if(user == null || user.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 根据session中的用户信息，到数据库中查询是否存在
        User currentUser = this.getById(user.getId());
        if(currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }
    /**
     * 用户注销
     * @return 注销是否成功
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        // 先判断是否登录
        Object attribute = request.getSession().getAttribute(USER_LOGIN_STATE);
        if(attribute == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"未登录！");
        }
        // 移除session中用户信息
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    /**
     * 密码加密
     * @param password 原始密码
     * @return 加盐后的加密密码
     */
    @Override
    public String getEncryptPassword(String password) {
        final String salt = "wmz0204";
        return DigestUtils.md5DigestAsHex((salt + password).getBytes());
    }
    /**
     * 获取脱敏后的用户信息
     * @param user 用户实体类
     * @return 脱敏后的用户信息
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if(user == null) {
            return null;
        }
        LoginUserVO loginUser = new LoginUserVO();
        BeanUtils.copyProperties(user,loginUser);
        return loginUser;
    }
    /**
     * 获取单个用户脱敏信息
     * @return 脱敏后的用户信息
     */
    @Override
    public UserVO getUserVO(User user) {
        if(user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user,userVO);
        return userVO;
    }
    /**
     * 获取用户脱敏信息列表
     * @return 脱敏后的用户信息列表
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        // 用户列表为空，返回一个空的list
        if(CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        // 不为空，则转换成脱敏后的list
        return userList.stream()
                .map(this::getUserVO)
                .collect(Collectors.toList());
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    /**
     * 判断是否为管理员
     * @param user 当前用户
     * @return true：管理员
     */
    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

}




